JAE mini sprint 109$

[regisparent]

now on zippkit.com for 109$
the kit
http://zippkits.com/~zippkits/index.php?main_page=product_info&cPath=71&products_id=263

[Brushless55]

Kick ass! :buttrock:

now who can build them for those who don't have the time to build :confused1:

[siberianhusky]

Mine is already part way done!

[Brushless55]

Being this one is small, maybe I do have the time to build it!

[martin]

On the type of flex shaft & stuffing tube used in this design does the stub shaft just run in the brass outer tube & the flex in the teflon liner. Does the dog run against the stuffing tube end or is the end load taken against the motor bearings. Thanks Martin.

[Joe Petro]

The prototype used a teflon liner and a thrust washer at the "strut".

The production kits will use no liner, and the motor bearings will take the thrust.
We are working on a stub shaft design that runs directly inside the shaft tube...

Joe

[martin]

The prototype used a teflon liner and a thrust washer at the "strut".

The production kits will use no liner, and the motor bearings will take the thrust.
We are working on a stub shaft design that runs directly inside the shaft tube...

Joe
Joe is their any reason other than possible extra cost that your not using one of your 12 size Z struts. Thanks Martin.

[geraghty]

Joe is their any reason other than possible extra cost that your not using one of your 12 size Z struts. Thanks Martin.

I can answer this.....The stuffing box design decision had absolutely nothing to do with the cost........you just plain and simple do not need a strut cluttering up the transom of this boat......
The JAE design team tested the hell out of this system and it is bulletproof and a strut it is just simply not needed......If reliability was in question,.the JAE design team would never have recommended this system.....
The JAE team is dedicated to lowering the cost of model boating ,but never at the expense of a successful day at the lake.
If you are absolutely convinced you need more support,just take the next size up brass tubing and loctite it over the last couple inches of the stuffing box where it exits the ski.Do this before you cap off the rear of the ski and then seal the tub with it the 5 minute epoxy from the inside.:thumbup1:
I will say this again......
The JAE team is dedicated to lowering the cost of model boating ,but never at the expense of a successful day at the lake running a JAE design.:thumbup1:

[martin]

I can answer this.....The stuffing box design decision had absolutely nothing to do with the cost........you just plain and simple do not need a strut cluttering up the transom of this boat......
The JAE design team tested the hell out of this system and it is bulletproof and a strut it is just simply not needed......If reliability was in question,.the JAE design team would never have recommended this system.....
The JAE team is dedicated to lowering the cost of model boating ,but never at the expense of a successful day at the lake.
If you are absolutely convinced you need more support,just take the next size up brass tubing and loctite it over the last couple inches of the stuffing box where it exits the ski.Do this before you cap off the rear of the ski and then seal the tub with it the 5 minute epoxy from the inside.:thumbup1:
I will say this again......
The JAE team is dedicated to lowering the cost of model boating ,but never at the expense of a successful day at the lake running a JAE design.:thumbup1:
Thanks for reply, Also would you use a washer to take the thrust against the stuffing tube or against the motor bearings as planed. Cant wait to get one of these boats & have some fun with it. Thanks Martin.

[geraghty]

Thanks for reply, Also would you use a washer to take the thrust against the stuffing tube or against the motor bearings as planed. Cant wait to get one of these boats & have some fun with it. Thanks Martin.





Martin,
That will not work unless you have some sort of slip joint [I.E. a square drive coupler] in the driveline system and then......... you would also need to design someway to retain the driveline system in the boat to keep it from sliding out the back of the boat when you let off the throttle....
Taking the thrust at the motor bearings will be no problem whatsoever....
In fact when you install the driveline keep a 1/16" gap in between the drivedog face and the end of the stuffing box/stub shaft bushing assembly.

Rod Geraghty

[Brushless55]

does the kit come with a esc?
thanks

[Joe Petro]

No.
No electronics are included. Every other part or piece needed is included though.

We will have servos and ESC's available for them soon.

Joe

[Brushless55]

No.
No electronics are included. Every other part or piece needed is included though.

We will have servos and ESC's available for them soon.

Joe

ok:beerchug:
and these are ready now?
I think someone said they may have these prebuilt?

[martin]

Thanks Rod, Yes thats how i run my mini monos with the load against the motor bearings on outrunner motors running at 42,000rpm unloaded with no problems at all. Thanks Martin.

[Alexgar]

when will they be realeased?

[martin]

April 20th is the expected date providing every thing comes together. Thanks.

[Alexgar]

Can't wait my wife owes me a bday present and I think I just found it

[geraghty]

when will they be realeased?

The scheduled release date is 4-20-2011

[Rumdog]

geeeeez! did they sell out already, or did the date get bumped?

[pescador]

It's bumped until next week, if your signed up for the newsletter there is a wicked sale price. I ordered the motor, battery and 2.4ghz radio from Joe's links for a total of $40.

[Alexgar]

How do we sign up for the newsletter

[electric]

Just go tothe www.zippkits.com website and set up a login and asked to be notified when the boat is available. That will get you the email you need to get the discount.

[wparsons]

You don't need a discount to get that kind of pricing on the motor/battery/radio from HK.

Motor is $12.04
Battery is $11.29
TX/RX is $16.59

That's regular pricing listed on the site, not discounted for being a repeat customer too. With me logged in the pricing is:

Motor: $11.18
Battery: $9.49
TX/RX: $15.99

It's amazing what you can get for under $200 now!

[electric]

.....waiting for that email....when this boat going on sale........tick tick tick...

[geraghty]

I have no control over the release of the Mini-Sprint.....get ahold of Joe at Zippkits and ask him
for an update on the release date...... sales@zippkits.com

[electric]

I have no control over the release of the Mini-Sprint.....get ahold of Joe at Zippkits and ask him
for an update on the release date...... sales@zippkits.com

I know that, Just kidding around. Every day I check the email

[geraghty]

I know that, Just kidding around. Every day I check the email


:iagree:
I'm waiting with you.....I want one also and I am just as anxious as you are to see them released......:thumbup1:
I have no doubts that Joe is doing everything he can to get them out ASAP.....

[longballlumber]

Has anyone asked Joe (ZippKitts) if he has an updated time line for release? I would like to get a couple of these.

Later,
Mike Ball

[martin]

I spoke to Joe a few days ago about something else but also asked the latest on the Mini Sprint, Hes still waiting on some parts & said maybe around mid month. Martin.

[SweetAccord]

I like the JAE stuff but for less and all built and two inches larger you can get this:http://www.r2hobbies.com/men/proddetail.php?prod=rcbt0401005

It's big brother seems successful.

http://forums.offshoreelectrics.com/showthread.php?t=23946

[electric]

Just went on sale (in stock) this morning.

[martin]

Yes ordered mine this morning with the $20 reduction for registered news letter subscribers, Their going fast (hopefully they will when built as well). Martin.

[Doug Smock]

I like the JAE stuff but for less and all built and two inches larger you can get this:http://www.r2hobbies.com/men/proddetail.php?prod=rcbt0401005

It's big brother seems successful.

http://forums.offshoreelectrics.com/showthread.php?t=23946

Or not.
http://forums.offshoreelectrics.com/showthread.php?t=25105

I'm sure you'll see pre built minis by qualified builders before it's all said and done.

Doug

[martin]

Yes the R2 Hobbies hydros are cheap to buy, But is it worth the hassle as Doug has pointed out in the thread still running on rebuilds the are neseassary to get a good reliable boat. They also have a question mark over the quality of the ply wood they use, I may be wrong but it looks like packing case quality ply. Its certainly not birch ply. They are cheap though. Martin.

[pescador]

Looks like I got the last Sprint.

[NativePaul]

Dagnammit, why did I have to go to work today, I missed out.

[martin]

Zipp kits sold out in 90 minutes but expect to have more stock Wednesday. Martin.

[martin]

Zippkits have Mini Sprints back in stock but not many left. Martin.

[Joe Petro]

MS kits back in stock. Now also available pre- built.

http://zippkits.com/~zippkits/index.php?main_page=index&cPath=71

http://zippkits.com/~zippkits/index.php?main_page=index&cPath=77

[Brushless55]

MS kits back in stock. Now also available pre- built.

http://zippkits.com/~zippkits/index.php?main_page=index&cPath=71

http://zippkits.com/~zippkits/index.php?main_page=index&cPath=77

Awesome! :thumbup1:

[electric]

Wow..the pre-built ones sold out in a like a second... I am in the middle of a build on one these, going well ...

[§Bodo§]

Hello,
what motor do you recommend for this model. The motor zippkit recommended from hobbyking is on backorder. Will a Leopard LBP2848/9T 4370KV fit in (mounting holes and diameter with/or without? cooling jacket). As I understand they drive the hobbyking motor without cooling?
Regards
Bodo

[martin]

The bolt spacing on the mount is a standard 19mm centres so the Leopard motor will fit the mount, The Leopard motor is an inrunner so needs a water cooling jacket which obviously will make the motor a bigger diameter so you may have issues with the water jacket not getting low enough in the mount without touching the tub bottom. The motor they recomend is an outrunner so therefore is air cooled. Martin.

[wparsons]

The leopard motor is also longer and may not fit under the hatch. Here's a few others that might work from HK, no experience with them though so you may want to read the reviews.

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8137

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6387

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9257

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8616

The lower kv motors would require a different prop, but there is another 4400kv one in the above links.

[martin]

If your using the kit then motor length shouldnt be an issue as it comes with a cowling & not a flat hatch cover, Ive got the kit in front of me ready for build & the main issue would be clearance on the tub bottom with the water jacket. It could be modded to take the Leopard motor by filing the mount holes to raise the motor a bit, Just depends how much you would need to raise the motor though. You would also have to align the stuffing tube to suit the slightly higher drive line of the motor. With the 28mm outrunner motor fitted in the mount theirs around 3.5 mm from the motor can to the tub bottom at its lowest point not sure if thats enough for a water jacket to clear on a 28mm can inrunner + jacket. Martin.

[§Bodo§]

Thanks a lot, martin and wparsons. I think i´ll try the 4400kV motor wparsons mentioned above.
Bodo

[Brushless55]

what would be a great 3s motor?

[wparsons]

Something in the 3000-3200kv range in the same size should do the trick!

[siberianhusky]

I'm doing a scratch build of one, the hull and sponsons are done but I have other projects to finish before this one gets power.
Planning to try a Tacon 28mm motor, undecided on length. Not using the stock motor mount idea so I can play with positions.
I'm using aluminum C channel for a mount that spans the width of the hull and bolts in on both sides.

[lectriglide]

Got my pre-built mini sprint yesterday and noticed right off the ski isn't centered on the tub and it's cock-eyed. How critical is the ski position and will this cause a problem?

[Brushless55]

That's interesting....

[geraghty]

That will make absolutely no difference whatsoever to the boats performance......Your JAE Mini-Sprint will not care.....
Finish er' up and go run the boat.....:-)...:-)

[wparsons]

Plus, it is centered and straight, it just bulges out in the middle. Your measurements at the front and back are within 0.3mm of each other.

[geraghty]

Plus, it is centered and straight, it just bulges out in the middle. Your measurements at the front and back are within 0.3mm of each other.

Once again,that will be fine .....the boat will not know the difference......:thumbup:

[lectriglide]

Plus, it is centered and straight, it just bulges out in the middle. Your measurements at the front and back are within 0.3mm of each other.

If you look closely, it's actually out 2.4mm front to back on the left (37.1 vs 39.5)
and 1.6mm front to back on the right side (39.0 vs 37.4), therfore my concern.

It's all moot since Mr Geraghty says it doesn't matter. I need to get a motor and finish it up. Actually can't wait to get it in the water.

[NativePaul]

Can I just confirm that there isn't any hydrodynamic or aerodynamic reason for putting the 1/8th" basswood strips for the tub top on the outside? It's just for ease of building right? I think it would look a lot better without the overhang on most of sides at the top of the tub and intend to apply basswood strips internally and sand it off the outside if it's just for ease of building.

[wparsons]

I think they're there for ease of taping the hatch on. Without them there's very little material to hold the tape.

[Doug Smock]

I think they're there for ease of taping the hatch on. Without them there's very little material to hold the tape.

:thumbup:

[electric]

Just ran my mini sprint for the fist time. Really ran great! Fun boat for a small pond and turns on a dime. I did clock some faily high temps 160's. Wondering on these outrunner's what is exceptable? More than an Inrunner? Here is a pic of the boat with it's big brother which I also test ran today. It did around 52mph, but has a lot more because I was testing in a very small pond near my house. Great for a quick test, but no room for error with a bigger faster boat.

[Brushless55]

Just ran my mini sprint for the fist time. Really ran great! Fun boat for a small pond and turns on a dime. I did clock some faily high temps 160's. Wondering on these outrunner's what is exceptable? More than an Inrunner? Here is a pic of the boat with it's big brother which I also test ran today. It did around 52mph, but has a lot more because I was testing in a very small pond near my house. Great for a quick test, but no room for error with a bigger faster boat.

52mph
holly crud, I did not think these were going that fast :w00t:

[lectriglide]

electric - are you using the same motor as the prototype? I'm looking for something compatible and just curious what you are running.

[electric]

Yes, I am running the turnigy 4400kv that was orginally recommended when they went on sale.

[electric]

52mph
holly crud, I did not think these were going that fast :w00t:
The big one..not the mini.

[Alexgar]

The renegades do 40 so it's only a matter of time before the mini sprint take on the 50 mark

[Rumdog]

Outrunners will run hotter obviously. 160 is expected. That would be acceptable by my standards.

[wparsons]

I bet if you could fit a leopard 2860 in one you'd hit mid 50's if it stays on the water. You'd need a bigger ESC as well, and the weight would help keep it down a bit.

[martin]

With the right choice of $12 outrunner on 3s & $20 esc & correct prop you will hit mid to high 50s. This is my set up in a 15" mono v hull, Imagine how much faster a rigger is going to be over a mono v hull. Im aiming for 60mph on this budget set up,Martin.

http://www.youtube.com/watch?v=AuDAKRRtLA0

[HibridO]

With the right choice of $12 outrunner on 3s & $20 esc & correct prop you will hit mid to high 50s. This is my set up in a 15" mono v hull, Imagine how much faster a rigger is going to be over a mono v hull. Im aiming for 60mph on this budget set up,Martin.

http://www.youtube.com/watch?v=AuDAKRRtLA0

Which $12 outrunner?

[Rich]

How big of a motor with cooling jacket will fit in this little hull? And how long can the motor be?

[electric]

Ran though two sets of packs today, the temp seems to stay round 160's at the end of each run. Thought about gettings some water cooling in there, but what a challenge with the limited space. I will stick with the air cooled for now.

This boat is unbelievably stable and the turns on it are something to see. Really nice handling boat. Good Job Zipp.

[martin]

I think a Leopard 2860 might be to much at 1300w, This is a tiny boat. You may stand a chance with the less powerfull 2850 at 800w. Re getting these bigger diameter because of water cooler & longer can water cooled motors in, The front of the motor will touch the front of the cowling so mods will need to be done to the cowling. You will have issues with the water cooler clearing the tub bottom, Not by a lot & not to difficult to mod by raising the motor up on the mount or using a bolt in mount so you could try different configeration motors & sizes. Im sticking for now with my $12 outrunners which im sure i can get close to 60mph. I just get an extra buss knowing these speeds are capable with such cheap & simple motors. I must say a thanks to Joe at Zippkits for producing a superb quality kit, Everything in the kit fitted perfectly & also the JAE team for their hard work on the design of the boat. Im about 75% + paint their so cant wait to run it. Martin.

[Brushless55]

The big one..not the mini.

Oh, so maybe mid 40's with the mini?

[electric]

Oh, so maybe mid 40's with the mini?

Hard to guess with the size diference in the boat. Tempted to try, but I will leave it at that without my datalogger hooked up.

[Joe Petro]

Since the HK brushless motors are so hard to get, we ordered some directly from the manufacturer.
We will have 4400 and 3500 Kv motors in stock soon.

The 3500 motors should be good for the kids, and may even be pretty good with a slightly larger prop (we have the 432 in stock).

If you subscribe to our newsletter, we will notify you when these arrive...

Joe

P.S. Thanks for the kind words! Why not do a review on our site of the MS?

[Brushless55]

I think the 3500kv on 3s could rock real good!

[Rich]

I think the 3500kv on 3s could rock real good!

:iagree: has anyone tried it yet? I know the kit is relatively new...

[longballlumber]

I am in the process of building mine right now. I haven't bought a motor yet and was thinking of going the 3500kv'ish and 3S. I know that Zipp has recommended the 2200mAh batteries, but does anyone know what the max battery size that will fit in the hull? I would like to get the most mAh as possible for the amp draw head room.

Thanks
Mike

[electric]

Mike,
I spent some time last weekend trying to see if I could fit a bigger battery in than the 2200. The issue is the batteries start to get to long and hit the shaft as it bends up to the motor. So, the best I could find was the 2200. Others, may have found something I did not, so we will see.

[longballlumber]

Mike,
I spent some time last weekend trying to see if I could fit a bigger battery in than the 2200. The issue is the batteries start to get to long and hit the shaft as it bends up to the motor. So, the best I could find was the 2200. Others, may have found something I did not, so we will see.

OK, thanks for the reply. I wanted to put an order in for batteries and a motors from Hobby King soon. Looks like I will be sticking with the 2200's then.

Later,
Mike

[martin]

Are you getting 2200mah 3s battery in with the esc ok or are you having to put the esc some where else & not on top of the battery as my esc (not the Zippkits esc ) will not go on top as it stands above the tub. Thanks Martin.

[electric]

I have not tried the 3s so can't tell you. I did try putting a 3s 3000 in there and no luck. To long. So long as the length of the 3s is not more than 5mm more or so than the 2s and it is just a bit thicker it should squeeze in there. Just a guess though.

[martin]

I found 3s 2200mah wont go in with esc on top of lipo,The tub depth inside to under the lip is 32mm.A 3s is around 24mm-26mm depending on type.That only leaves 6mm-8mm for the esc,My esc is 15mm so no go.A 2s is only 16mm deep so leaves 16mm for esc so is ok. I built mine to run 3s so will mod the tub deck by fitting a second deck raised up 8mm with a slightly steeper curve at the front of the deck. With the cowl sitting on the raised deck. Martin.

[electric]

I found 3s 2200mah wont go in with esc on top of lipo,The tub depth inside to under the lip is 32mm.A 3s is around 24mm-26mm depending on type.That only leaves 6mm-8mm for the esc,My esc is 15mm so no go.A 2s is only 16mm deep so leaves 16mm for esc so is ok. I built mine to run 3s so will mod the tub deck by fitting a second deck raised up 8mm with a slightly steeper curve at the front of the deck. With the cowl sitting on the raised deck. Martin.

I did recall seeing a picture where they had put the esc to the side of the motor. Turned on its edge. I am using a left over 120amp esc I have so that is out of the question, but thought I would throw that out there if you had a smaller esc...

[martin]

I use 60amp watercooled esc on my micro boats as i do run quite hot setups on large props, But even on say an air cooled esc which they sell for this boat i think youll have problems getting 3s + esc in. Along side the motor theirs only 10mm & thats touching the motor so out of the question on an outrunner with the body spinning. Unless your using a very small low amp esc i think your going to struggle getting 3s in. Like i said im going to mod mine on top of the tub so im not going to be craming everything in such a small space on 3s. As well as its a very simple mod to do. Martin.

[Turbo Dan-O]

Which $12 outrunner?

Haha...I am still trying to figure this out! Spill the beans Martin!!!

[martin]

Haha its a mystery !!! Martin.